LevelDB init
move work on LevelDB
woo, NodeBB actually works on LevelDB
added to database tests
LevelDB installation questions
not all DB's use a hostname
cleanup
removed newline
LevelDB - organization
more cleanup
forgot to use the passed in fn
Merge remote-tracking branch 'origin/master' into LevelDB

Conflicts:
	tests/database.js
making changes for compatibility with 9d405812cb7fa5368c55b8632dff070b2bcabbcc
added instructions for adding a test database for Level DB #1373
fixed sortedSetRevRangeByScore test
closed #1375